Second chromosomes were collected from nature which, when heterozygous with a normal chromosome 1 in males, are present in functional sperm much more often than the expected 50 percent. This phenomenon, named segregation distortion, was found to depend on a locus named Segregation-distorter (symbolized SD), which is located near the centromere (and probably in the right arm) of chromosome 1
https://www.geneconvenevi.org/wp-content/uploads/2020/04/Genetics-73.png300300Academic Web Pages/wp-content/uploads/2019/10/GC-color-logo-for-header-3277-x-827-1030x260.pngAcademic Web Pages1960-01-12 00:00:002020-04-22 16:49:57Meiotic drive in natural populations of Drosophila melanogaster .5. On the nature of the SD region